Why Build One?
Whether you are building a modern CMS, an in-browser markdown editor, or a custom blogging platform, real-time text analysis is a fundamental utility. While a basic word count might seem simple at first glance, accurately handling edge cases such as non-standard whitespace, multi-line line breaks, symbols, and reading time estimates requires a firm understanding of string manipulation and performance optimization in JavaScript.
In this guide, we will build a performant, dependency-free text metrics engine from scratch.
Counting Words Accurately
The naive approach to word counting usually looks like this:
